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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd21603e1a5858c9d0b35f2394cb0808d38286336c914ed3ea3a0c0094553e511' 
  AND token = 'MisR6heOcxZ2JRn9J2sj/TOaLzC+Xt6sKzhSe3T93zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}